Basement Window Exhaust Fan
To build the support, we used hardware-store 5⁄8 " aluminum U-channel screwed to our existing metal basement window frame. We pop-riveted the 12" guard-mounted exhaust fan to two strips of 1⁄8 x 3⁄4 " aluminum that in turn were riveted to the U-channel. The size of the fan will depend upon your window size. Our 12" fan delivers 828 cfm and has a totally enclosed motor suitable for dusty environments.
WARNING: Do not use the exhaust fan in an area where pushing air out of the workshop room can reverse the flow of the chimney for the furnace and possibly bring exhaust gases into the house. The structure we used the fan in was warmed with electric heat and didn't require such a precaution.